Re: [Swig-user] How to get C++ exceptions in Python?

[Kris T. <kri...@gm...>]

> From: michael kapelko  Sent: 13 October 2012 16:04
> I can't make Python print correct C++ exception that I throw (with
> exception.what() message).
> Here's the example:
> https://dl.dropbox.com/u/12634473/swig_py_exception.tar.bz2
> 
> Building:
> 
> [kornerr@korenmain swig_py_exception]$ make
> swig -includeall -python -c++ foo.i
> Exception.h:11: Warning 401: Nothing known about base class
> 'std::exception'. Ignored.
> Exception.h:31: Warning 473: Returning a pointer or reference in a
> director method is not recommended.
> g++ -fPIC -shared -o _foo.so foo_wrap.cxx -I/usr/include/python2.7
> 

I haven't downloaded your source, but did you 
%include "exception.i"
at the start of the .i file? I followed the swig user's guide more or less
verbatim to catch all exceptions, and it just works

%module stir
 %{ 
 // blab la
%}
# catch all C++ exceptions in python
%include "exception.i"

%exception {
  try {
    $action
  } catch (const std::exception& e) {
    SWIG_exception(SWIG_RuntimeError, e.what());
  } catch (const std::string& e) {
    SWIG_exception(SWIG_RuntimeError, e.c_str());
  }
}

// etc

Kris